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  <title>Fetches the document pointed to by a database reference</title>

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</div><hr /><div id="mongocollection.getdbref" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">MongoCollection::getDBRef</h1>
  <p class="verinfo">(PECL mongo &gt;=0.9.0)</p><p class="refpurpose"><span class="refname">MongoCollection::getDBRef</span> &mdash; <span class="dc-title">Fetches the document pointed to by a database reference</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mongocollection.getdbref-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">array</span> <span class="methodname"><strong>MongoCollection::getDBRef</strong></span>
    ( <span class="methodparam"><span class="type">array</span> <code class="parameter">$ref</code></span>
   )</div>

 </div>


 <div class="refsect1 parameters" id="refsect1-mongocollection.getdbref-parameters">
  <h3 class="title">参数</h3>    
  <p class="para">
   <dl>

    
     <dt>

      <em><code class="parameter">ref</code></em>
     </dt>

     <dd>

      <p class="para">
       A database reference.
      </p>
     </dd>

       
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-mongocollection.getdbref-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the database document pointed to by the reference.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-mongocollection.getdbref-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1425">
   <p><strong>Example #1 <span class="methodname"><strong>MongoCollection::getDBRef()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$playlists&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$db</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">playlists</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$myList&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$playlists</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">findOne</span><span style="color: #007700">(array(</span><span style="color: #DD0000">'username'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #DD0000">'me'</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">//&nbsp;fetch&nbsp;each&nbsp;song&nbsp;in&nbsp;the&nbsp;playlist<br /></span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">$myList</span><span style="color: #007700">[</span><span style="color: #DD0000">'songlist'</span><span style="color: #007700">]&nbsp;as&nbsp;</span><span style="color: #0000BB">$songRef</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$song&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$playlists</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">getDBRef</span><span style="color: #007700">(</span><span style="color: #0000BB">$songRef</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$song</span><span style="color: #007700">[</span><span style="color: #DD0000">'title'</span><span style="color: #007700">]&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <div class="example-contents"><p>以上例程的输出类似于：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
Dazed and Confused
Ma na ma na
Bohemian Rhapsody
</pre></div>
   </div>
   <div class="example-contents screen"> <br />
    In the above example each $songRef looks something like the following:<br />
    <div class="cdata"><pre>
    Array
    (
        [$ref] =&gt; songs
        [$id] =&gt; 49902cde5162504500b45c2c
    )
    </pre></div>
   </div>
  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-mongocollection.getdbref-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="mongocollection.createdbref.html" class="methodname" rel="rdfs-seeAlso">MongoCollection::createDBRef()</a> - 创建一个数据库引用</span></li>
   </ul>
  </p>
 </div>


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